Huawei Huawei Huawei Telecom Italia China Mobile NICT Nokia China Telecom This document suggests the necessity of an architectural framework for network telemetry in order to meet the current and future network operation requirements. The defining characteristics of network telemetry shows a clear distinction from the conventional network OAM concept; hence the network telemetry demands new techniques and protocols. This document clarifies the terminologies and classifies the categories and components of a network telemetry framework. The requirements, challenges, existing solutions, and future directions are discussed for each category. The network telemetry framework and the taxonomy help to set a common ground for the collection of related works and put future technique and standard developments into perspective.